If you close the chat window bedoew logging off, you’ll have to open the window. But the hat stays up and active. For example, I created Critter’s Corner and put all my alts in the channel. This way I can link something to my accounts even when in different corps or alliances (like fits to buy for my hauling/market alt). When I log out Lady, the channel still stays open and my alts can still use it. I’ve invited select friends to the channel as well and they have access whenever too.

That said there are admin tools you can use for a chat channel including adding other moderators and such too.